Enum aws_sdk_m2::types::EngineType
source · #[non_exhaustive]pub enum EngineType {
Bluage,
Microfocus,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against EngineType
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let enginetype = unimplemented!();
match enginetype {
EngineType::Bluage => { /* ... */ },
EngineType::Microfocus => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when enginetype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant EngineType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
EngineType::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant EngineType::NewFeature
is defined.
Specifically, when enginetype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on EngineType::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Bluage
Microfocus
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl EngineType
impl EngineType
source§impl EngineType
impl EngineType
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for EngineType
impl AsRef<str> for EngineType
source§impl Clone for EngineType
impl Clone for EngineType
source§fn clone(&self) -> EngineType
fn clone(&self) -> EngineType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for EngineType
impl Debug for EngineType
source§impl Display for EngineType
impl Display for EngineType
source§impl From<&str> for EngineType
impl From<&str> for EngineType
source§impl FromStr for EngineType
impl FromStr for EngineType
source§impl Hash for EngineType
impl Hash for EngineType
source§impl Ord for EngineType
impl Ord for EngineType
source§fn cmp(&self, other: &EngineType) -> Ordering
fn cmp(&self, other: &EngineType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for EngineType
impl PartialEq for EngineType
source§fn eq(&self, other: &EngineType) -> bool
fn eq(&self, other: &EngineType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for EngineType
impl PartialOrd for EngineType
source§fn partial_cmp(&self, other: &EngineType) -> Option<Ordering>
fn partial_cmp(&self, other: &EngineType) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for EngineType
impl StructuralPartialEq for EngineType
Auto Trait Implementations§
impl Freeze for EngineType
impl RefUnwindSafe for EngineType
impl Send for EngineType
impl Sync for EngineType
impl Unpin for EngineType
impl UnwindSafe for EngineType
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more